Properly override the port attr in the binary role

lib/Selenium/CanStartBinary.pm

@@ -89,7 +89,7 @@ C<127.0.0.1:4444>.
 
 =cut
 
-has 'port' => (
+has '+port' => (
     is => 'lazy',
     builder => sub {
         my ($self) = @_;

lib/Selenium/CanStartBinary/FindBinary.pm

@@ -56,6 +56,7 @@ sub _validate_manual_binary {
 
 sub _naive_find_binary {
     my ($executable) = @_;
+
     my $naive_binary = which($executable);
     if (defined $naive_binary) {
         return $naive_binary;